diff --git a/cash/admin.py b/cash/admin.py
index a2aeda5..13ea26d 100644
--- a/cash/admin.py
+++ b/cash/admin.py
@@ -1,35 +1,86 @@
 from django.contrib import admin
 from cash.models import *
+from django import forms
+from django.template.defaultfilters import escape
+from django.core.urlresolvers import reverse
 
+class AccountForm(forms.ModelForm):
+	credit_change = forms.DecimalField(max_digits = 5, decimal_places = 2, required = False)
+
+	class Meta:
+		model = Account
 
 class AccountAdmin(admin.ModelAdmin):
-	list_display = ('user', 'card_number', 'credit')
+	list_display = ('user', 'card_number', 'credit', 'transaction_link')
+	form = AccountForm
+	readonly_fields = ('credit',)
+
+	def transaction_link(self, account):
+		return '<a href="%s?account__id__exact=%d">Transaktionen</a>' % (reverse("admin:cash_transaction_changelist"), account.id)
+
+	transaction_link.allow_tags = True
+
+	def save_model(self, request, obj, form, change):
+		# TODO: Auslagern
+		PAYOUT_SUBJECT = "Auszahlung"
+		DEPOSIT_SUBJECT = "Einzahlung"
+		DESC = "Autorisiert von %s %s"
+	
+		amount = form.cleaned_data['credit_change']
+
+		print amount
+
+		if amount is not None and amount != 0:
+			if amount > 0:
+				subject = DEPOSIT_SUBJECT
+			else:
+				subject = PAYOUT_SUBJECT
+
+			obj.change_credit(amount, subject, DESC % (request.user.first_name, request.user.last_name))
 
 
 class ProductBarcodeInline(admin.TabularInline):
 	model = ProductBarcode
 	extra = 1
 
-
 class ProductAdmin(admin.ModelAdmin):
 	list_display = ('name', 'category', 'price')
 	list_filter = ['category']
 	inlines= [ProductBarcodeInline]
 
-
 class ProductCategoryAdmin(admin.ModelAdmin):
 	list_display = ('name', 'comment')
 
-
 class SalesLogEntryAdmin(admin.ModelAdmin):
 	list_display = ('account', 'timestamp', 'product', 'count', 'unit_price')
 	list_filter = ['account', 'timestamp', 'product']
 
+class TransactionAdmin(admin.ModelAdmin):
+	list_display = ('account', 'timestamp', 'subject', 'description', 'amount')
+	list_filter = ['account', 'timestamp', 'subject']
+	actions = None
+	date_hierarchy = 'timestamp'
+
+	# Disable tampering with the transactions completely
+	def has_add_permission(self, request):
+		return False
+	def has_change_permission(self, request, obj=None):
+		if obj is None:
+			return True
+		return False
+	def has_delete_permission(self, request, obj=None):
+		return False
+
+	# Needed to not trigger an ImproperlyConfigured exception
+	# FIXME: a bit too hacky
+	def changelist_view(self, request, extra_context=None):
+		self.list_display_links = (None, )
+		return super(TransactionAdmin, self).changelist_view(request, extra_context=None)
 
 admin.site.register(Account, AccountAdmin)
 admin.site.register(Product, ProductAdmin)
 admin.site.register(ProductBarcode)
 admin.site.register(ProductCategory, ProductCategoryAdmin)
-admin.site.register(Transaction)
+admin.site.register(Transaction, TransactionAdmin)
 admin.site.register(SalesLogEntry, SalesLogEntryAdmin)
 
diff --git a/cash/models.py b/cash/models.py
index 3ff835a..437bd53 100644
--- a/cash/models.py
+++ b/cash/models.py
@@ -27,6 +27,16 @@ class Account(models.Model):
 				instance.account.card_number = instance.ldap_user.attrs['employeenumber'][0]
 				instance.account.save()
 
+	def change_credit(self, amount, subject, desc):
+		self.credit += amount
+		self.save()
+
+		transaction = Transaction(account=self, subject=subject,
+								  amount=amount, description=desc)
+		transaction.save()
+
+		
+
 	def buy_products(self, products):
 		# TODO place it somewhere else
 		MAX_DEBIT = -35
@@ -37,10 +47,7 @@ class Account(models.Model):
 
 		total_value = sum(map(lambda p: p.price * products[p], products.keys()))
 		if self.credit - total_value >= MAX_DEBIT:
-			self.credit -= total_value
-			self.save()
-
-			descr = ''
+			desc = ''
 			for product in products.keys():
 				amount = products[product]
 
@@ -48,12 +55,9 @@ class Account(models.Model):
 				                         count=amount, unit_price=product.price)
 				logentry.save()
 
-				descr += '%dx %s\n' % (amount, product.name)
-
-			transaction = Transaction(account=self, subject=BUY_SUBJECT,
-			                          amount=(-total_value), description=descr)
-			transaction.save()
+				desc += '%dx %s\n' % (amount, product.name)
 
+				self.change_credit(-total_value, BUY_SUBJECT, desc)
 			return True
 		else:
 			return False